Imines/their preparation and their pharmaceutical use

ABSTRACT

IMINES OF 2-FORMYLQUINOXALINE-3-CARBOXYLIC ACID-1,4-DIOXIDES AND THEIR SALTS ARE OBTAINED THROUGH TREATMENT OF THE LACTONE OR A SALT OF 2-DIHYDROXYMETHYLQUINOXALINEN,N-DIOXIDE-3-CARBOXYLIC ACID WITH A REACTANT BEARING A FREE PRIMARY AMINO GROUP. THE RESULTANT COMPOUNDS AND THEIR NON-TOXIC SALTS ARE ANTIBACTERIAL AGENTS AND CAN BE INCORPORATED IN PHARMACEUTICAL COMPOSITIONS AND FEEDSTUFFS FOR THIS USE. A TYPICAL EMBODIMENT IS 2-(CARBOMETHOXYHYDRAZONOMETHYL)-QUINOXALINE-3-CARBOXYLIC ACID1,4-DIOXIDE.

United States Patent IMINES, THEIRv PREPARATION AND THEIR PHARMACEUTICAL USE Florin Seng, C'ologne-Buchheim, Kurt Ley, Odenthab Globusch, and Karl Georg Metzger, Wuppertal-Elherfeld, Germany, assignors to Bayer Aktiengesellschaft, Leverkusen, Germany No Drawing. Filed Mar, 31, 1 971, SenNo. 130,007 Claims priority, application Germany, Apr. 2,, 1970., P 2.0- 15 676.7 Int-.YCI. (3076 51/78 US. Cl. 260-240 G ABSTRACT OF THE DISCLOSURE I-mines of Z-fornwIquihoxalihe-3-carboxylic acidl,4-di'- oxides and their salts are obtained" through treatment of the lactone or a salt of 2-dihydroxymethylquinoxaline- N,N-dioXide-3-carboxy1ic acid with a reactant bearing a free primary amino group. The resultant compounds and their non-toxic salts are antibacterial agents and can be incorporated in pharmaceutical compositions and feedstulfs for this use. A typical embodiment, is Z-(carbomethoxyhydrazonomethyl)-quinoxaline-3-carboxylic acid- 1,4-dioxide.

The present invention relates to new imines of 2-formylquinoxaline-3-carboxylic acidJAz-dibxides and their salts, to processes for their preparation, to the use of the new compounds as medicaments 'in human medicine and veterinary medicine, totheir use as f'ee'dstufi additives, especially in raising young animals or fatstock, and to c0mp0- sitions adapted to this use.

The new imines and salts have the general formula:

in which each of R and R when taken independently is identical to or different from the other, and is selected from the group consisting of hydrogen, alkyltor substituted alkyl; or when R and R are taken together with the nitrogen atom to which they are attached a 5- to 7-membered heterocyclic ring optionally containing as a ring member oxygen, sulphur, $0 or N-alkyl;

Claims 3,819,6l6 Patented June 25, 1974 in which X is O, S or NH, and R and R are as above defined;

*NH-l'J-O-Rs 2e intwhich R is. alkylor. substituted; alkyl;

in which R is phenyl', pyridyl or norbornyl, and Xis as defined above;

R] NHCNHN/ in. which R R and X are as defined above; or (g) i HEN AN\ -NH,-C

A preferred group-of the imines and: salts of the invention are those of the above general formula (I in which:

Y has the meanings given above; each of R and R is identical to or different from, the

other andis selected from the group consisting of (a) alkyl or hydroxyalkyl' of from 1' to 4 carbon atoms or a 6-me1nbe'red or 7 memberled. mono; cycloor bicycloalkyl group;

in which each of R and R when taken independently is identical to or different from the other and is selected from thegroup consisting of hydrogen, alkyl or hydroxyalltyl of from 1 to 4 carbon atoms, or when R and R are taken together with the nitrogen atom to which they are attached, a- 6- membered heterocyclic ring optionally containing as a ring member oxygen or S0 R NH-C-N/ II R2 in which X is O, S or NH, and R and R are as herein defined;

N-'H(iiI O-R r in which R -is alkylor hydroxyalkyl or from r to .4; carbon atoms; and v NH(|iJ'E inwhich R is phenyl,v pyridyl or norbornyl, and

Aliphatic groups embraced by R and" R include straight-chain or branched alkyl groups of from l to 6, 1 preferably 1 to 4, carbon atoms. Cycloaliphatic radicals contain from 3 to 7, preferably 5 to 7, carbon atoms and include both monocyclic and bicyclic ring systems.

These aliphatic or cycloaliphatic groups can be optionally substituted, for example, by hydroxy, alkoxy, or acyloxy, the alkoxy and acyloxy groups containing 1 to 4, preferably 1 or 2, carbon atoms. The hydroxy group is the preferred substituent. Typical aliphatic and cycloaliphatic groups thus include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert.-butyl, n-pentyl, isopentyl, hexyl, 2-hydroxyethyl, cyclopropyl, cyclopentyl, cyclohexyl, bicyclo-(2,2,l)-heptyl (norbornyl), and the like.

The substituents R and R are hydrogen or alkyl of from 1 to 4, preferably 1 or 2, carbon atoms. These alkyl groups can be optionally substituted with hydroxy, alkoxy or acyloxy, alkoxy and acyloxy groups containing 1 to 4, preferably 1 or 2, carbon atoms. Thus included are ethyl, n-propyl, isopropyl, n-butyl, isobutyl and tert.-'butyl, as well as the corresponding groups substituted by hydroxy. R and R when taken together with the nitrogen atom to which they are attached, can also form a heterocyclic ring, preferably containing 6 ring members, and preferably with an oxygen atom, a sulphur atom, an N-alkyl group containing 1 to 4, preferably 1 or 2, carbon atoms,

or the S group, as a ring member in the p-position relative to the nitrogen atom to which R and R are attached.

R is an alkyl of from 1 to 4, preferably 1 or 2, carbon atoms which may also be optionally substituted by hydroxy, alkoxy, acyloxy, alkoxy and acyloxy containing 1 to 4, preferably 1 or 2, carbon atoms. The hydroxy group is a particularly preferred substituent. R thus embraces such groups as methyl, ethyl, Z-hydroxyethyl and the like.

The alkali metal cation Y is, for example, that of sodium or potassium, preferably that of sodium.

R is phenyl, pyridyl or norborn-2-yl. When R is pyridyl, it can be bonded in the 2-, 3- or 4-position relative to the pyridyl nitrogen atom.

The above class of imines are obtained according to the process of the present invention by treatment of 1- 0x0 3-hydroxy-l ,3-dihydro-furo- 3,4-b)-quinoxaline-4,9- dioxide, which has the formula:

or a salt thereof of the formula:

with an amine of the general formula H N-R, in which R is as previously defined, M is an alkali metal or alkaline earth metal cation and x is 1 or 2.

The salts of the formula can be obtained from the lactone of formula through treatment with alkali metal or alkaline earth metal hydrogen carbonates.

M is preferably the cation of sodium, potassium or most preferably calcium.

Both inorganic and organic polar solvents can be used as diluents for the reaction according to the invention, such as for example water, lower aliphatic alcohols of 1 to 4 carbon atoms, lower aliphatic nitriles such as acetonitrile, tetrahydrofurane, dioxane, dimethoxyethane, pyridine, dimethylformamide and the like.

The reaction according to the invention is carried out at a temperature of about 0 C. to about 50 C., preferably 20 C. to about 35 C.

In practice, the lactone or lactone salts are dissolved 5 or suspended in the diluent, and this solution or suspension is then treated with an appropriate quantity of the amine. The formation of the imine or of the imine salt takes place in a weakly exothermic reaction and the final product is then isolated through conventional methods.

The imine salts (1) can also be prepared by the reaction of the free acids with amines.

The salts may be obtained in a subsequent step by conventional techniques or directly in the reaction of the lactone with the amine. If about 2 mols of the amine per mol of lactone are employed, the product will. be in the form of that amine salt. If an alkali metal salt or alkaline earth metal salt of the lactone is employed, or if it is desired to obtain the free acid from the lactone, only about 1 mol of the amine per mol of the lactone or salt is required. The courseof the process according to the invention can thus be illustrated by the following equations:

0 o ,t it l o 2HzN- H f 0! 0 on N COOHsN H E CH=N@ o 0 T ll I O HzN-NH-CO-NH: --v f 011 0 on O T -OH f CH=N-NH-CO-NH:

o III COONa HzN- -CH3 OR a 0 OH 22 N COONa l CH=N-(ECH: 0 CH:

The following examples will serve to further typify the nature of this invention without being a limitation on the scope thereof.

EXAMPLE 1 23.4 g. (0.1 mol) of l-oxo-3-hydroxy-1,3-dihydro-furo- (3,4-b)-quinoxaline-4,9-dioxide are suspended in 60 ml. of

ass-rams '1 and 2:

water and 20 g. (0.2 mol) ot-60% strength aqueous iso- .1. it. .propylamine solution are added. The temperature is kept i below 30 C. by slight cooling. After a few minutes, a N6. Compound clear solution .is .produced. Evaporation .in rvacuo yields 3' i 45 g. of the compound of the formula T o o OHgN-CH;

0 6 CH: III COOHzN-C lOH= NCH,

CH3 4"--- O N CH=NCfi I 6 GB 185786 8 cm ooomN-onn in the form of yellow crystals, whichafter recrystallisation from isopropanol melt at 123- 25" (3., .with-decom- 4' position. O

Analysis.--Calculated for C H N O (molecular v 0 1 weight 334 (percent): c, 57.5; H, 6.6; N, 16.8. Found 1} 6 Q (percent): C, 57.1; H, 5.8; N, 16.8. COOHaN-UaH1 EXAMPLE 2 /CH=N-'C3H1 27.4 g. (0.1 mol) of 'the "Na salt of Z-(di-hydroxyf methyl)-3-carbox-ylic -acid-quinoxaline-di-Nmxide are dis- O solved in 100 ml. of water and 7.3 g. (0.1amol) of tert.- CH butylamine are added. The temperature is kept at 25 C. 0 e e 3 1138719 by cooling. After 1 hour, the solution is evaporated in T /COOHSN C CH vacuo and 32 gnof the compound of the formula l (EH:

CH 0 y I a /N\ COONa O 61% 0 e e r o11=N-( BoH, :35 A} H CH: j

V are obtained in the .form .of yellow-crystalswhich after l CH N recrystallisation from acetonitrile/water melt at"'228 C., 0 with decomposition. 5? r Analysis.--Calculated for C H N NaQ (molecular /N 9 a; weight 311) percent): C, 54.0; H, 4.5; N, 135 Na, 7.4. Ha -YO-H Found (percent): C, 53.7; H, 4:9;FN, T1355; N-a, 6.9.

The 1-oxo-3 :hydroxy-l,3-dihydro-furo-( 3,4-1b)-quinoxy- -Q aline-4,9-dioxide of the formula cf):requ-iredas the start- .1, ing compound can h'e obtained as follows: 0

30.7 g. (0.1 mol) of 2 -bismethoxy-rnethyl-3-dimethylg @202 aminocarbonyl-quinoxaline-1,4-di-N-oxide are introduced N into 100 ml. of 10% strength aqueous hydrochloric acid. 000M A clear solution results, and after ,aehorttime the compound according to the invention separates out in the form GIL-71H of a yellow precipitate,-which-isfilteredofl? after 6? hours. t 17 g. (72.6% of theory) of l-oxo-3-hydroxy 1;3 dihydrokm 0 furo-(S,4-b)-quinoXaline-4,9-dioxide are thus obtained in g 1442 .theform of yellow crystals. 9 (B The compound is purified by dissolving it in sodiumbi- IGOOEPPNE carbonate solution, filtering and acidifying the filtrate. v The purified compound melts at 156-159%C., whilst foam- CH=N N'H' ing. '60 l Analysir calculated'for"C HgNO '(235) (percent) {In g C, 51.3; H, 2.6; N, 12.0. Found (percent): C, 52.0; H, T 2.8;N,-12.6. N 9 ea The alkali metal salts or alkaline earth 'm'etal -salts-0f COOH!N N\ 1 -,oxo-3-hydroxy-1,3-dihydro-furo-(3,4b)-quinoxaline-4, "9-dioxide can be'manufacture'd as followsz N The lactone (9 is'suspended inwater and -approxi- 9 mately the stoichiometrically required amount of the .alkali metal "hydrogen carbonate or alkaline earth metal 0 ,263 hydrogen carbonate is added-at room temperaturefThe-salt I; of the 'lactone (10), thus produced, precipitates, after \C00H evaporation of the --solution'if necessary, and can-be isolated in'the usual manner. N-Hi The following are obtained analogously :to *EXamples 1 O TABLEContinued TABLE-Continued Melting Melting Ex. point Ex. point No. Compound C.) No. Compound 0 o 23---- 0 205 /N\ coon COONa H /CHa H: -N -c-00 N C N H l a \N/ -CH=N-NH-fiI-N l 1 s on;

COONa /CH 15 COONa N CH=N N -OH=N NH'-C-NH,

1 CH; N II 0 1 NH I 25-... (T) 219 -oooNa J i COON N H: -N 0 C N N .I 8 25 1 In 16--.. 227

N 26 o 0 275 -oooNa T T 30 OOONa HzN- GH=N-N so: i:

CH=NNHC o u N T N 27 0 i1 7 CQONB, I

COONa CH=N-NHC00CH| l OH=NNHC 0 40 N H 18--.. (T)

N COONa E 2o9 CH==N-NH|J-NH: COON l 0 GOONa 212-213 N CH=N-NHC 0N 0 00011 I 0 \N//'CH=N--NHC 0 0 Cali: 20m; g 230 l 0 N COONfl 30..-- 156-157 CH=N-NH-G00-C:Hs /N\ coon 1 0 cH=N-NHcooon,0H,0n 21---. 179 f N 0 COONB 1 Decomposition.

CH=N NH C OCH CH OH As has already been mentioned, the new compounds of l the invention surprisingly show an excellent chemothera- 0 peutic activity. Their chemotherapeutic action was ex- 22- 0 1250 amined both in animal experiments (oral and subcutane- 1; v ous administration) with acute bacterial infections, and COONa in vitro. In both cases the compounds show a very good antibacterial-action, and the range of action encompasses N, CH=N-NHCO- N both Gram-negative and Gram-positive bacteria. The l chemotherapeutic activity of thecompounds according to 0 the invention permits their use in human medicine and in veterinary medicine. Furthermore, the compounds can be employed as fedstulf additives, especially in raising young animals or fatstock. The good in vitro and in viva activity of the compounds according to the invention can be seen TABLEC'fi ti1iu6d com ound of Bacterium: Ekainple' 13 Staphylococcus Zzure'us 133 1 from Tables 1, 2 and 3 Staphylococcus aur'eus 7705 r 1'2 The mmimum inhibitory concentrations in vitro for s h locwm m g L 12 some of the new compounds shown in Table l tMIC) Neiss'gj-ia a yzg s N 17- 5 were determined by the plate test in an agar medium of Mycoplasma gdllisepit'eum 6 the following composition: Mycoplasma gdlligpficum 1 5 G. per hire 1( Mycoplasma granular-n1 3 Proteose n e Mycobacterium tuberculosis H 37 RV 40 ggi ggg (sohds) "f""" g? Meas'ure'd in a PPLO ifiediuin. Sodium chloride ,0 For the p u of xamp e 3, efo o i g minimal Disodium phosphate Z0 inhibitory concentrations (MIC) y/ml. of nutrient medis m acetate n were s red by he series dilution test (-PPLO Adenine ulphate Q01 rne i m), in ation temperature 37 (3., determination Guanine hydrochloride 0.01 after 18, 24 n 48 hours- 0;01 Bacterium: Mic Xanthln Mycopla'sma' gallise'pzic'llr'ti 100 Neutral agar Myc'oplairma gra'niclamm 25 5.10 10 germs were inoculated per plate. Readings Mycopzasma bovirhihig 200 were taken after 24 and 48 hours, and the incubation t'em- In animal experiments on mice, the effective 100% perature was about 37 C. U dose (ED in mg./kg. was determined for c rtain com- TABLE 1 25 pounds of the invention after intraperitoneal infection and Mlom allmlmimedium subcutaneous (s.c.) or oral (13.0.) administration of the preparation. Compound oi' TABLE 3 Bacterium Ex. 10 Ex. 12 Ex.13 v

I J e e Compound of- Escherichia coliA261 20 K v 'I h t Escherichia coli 0 165 50 Ex. 3 Ex. 8 Ex. 13 Ex. 14 Proteus vulgar-1'8 species 150 10 t r Pseudomonas aerugiuosa Bonn 100 Bacterium v 8.0. P.o. S.c. P.o. S.c. P.o. Sic. PxO. Pseudomonas aeru'giuoso Walton." 100 Klebsiella p" 63 100 Escherichia coli 0 Kleto sz'clla I 8085 20 .165 50 100 50 100 25 25 50 100 Staphylococcus aureus 133 10 Staphylococcus Streptococcus pyogenesw 100 ureus 133;"-.. 25 I 50 TABLE 2 In general, it has proved advantageous, in acute general v infections, to administer amounts of about 5- mg. to about mf mhlbltory PQ I C WWI- 40 200 mg. per kilogram, preferably about 25 to about 50 i F l by h genes dllutlof test m k mg. per kilogram of body Weight per day, to a'ehieve effe'c' b c tempetaturtfl 3 determma' tive results. Nevertheless it can at times be necessary to tion of th M C after 8, 24 and 48 hours deviate from the amounts lrnantioned, in. particular d'e- Co'mp'ound of P g 011 he body weight of the test animal or patient Bacterium; Example 13 or on the nature of the method of administration, but also S mw f l A CC 9700 50 I because of the type of animal and its individual behaviour Streptococcus fa'ecalis ATCC 8564 100 t d t e di me or c s of he nature of the Streptococcus faemlis A 53 50 formulation of the latter, and the point in time or inter- Strepto'cocous fae'cal is ATCC 8693 100 val at which admlnistratlon takes place. Thus it can, in Streptococcus faecalis C 3 9 100 50 some cases, suffice to use less than the above-mentioned s f li C 71 50 min mum amount; Whilst rn other cases the upper limit Streptococcus faecalis ATCCv 100 mentioned must be exceeded. In thecase of the administrastrepwc-occus faecalis ATCC Blaschke .2.5 non of larger amounts it can be advisable to divide these Streptococcus f g l ATCC 13 25 into several individual doses over the course of the day. Streptococcus lis A C Species 100 The same range of dosages is envisaged for administration Streptococcus faecalis ATCC liqueg 50 in human medicine. The other comments made above also Streptococcus faecalis ATCC durans 25 PEflY 111 a general Sense- Escherichia coli c 165 50400 A r ingly, he present invention provides a pharma- Escherichia coli 2 25-50 c ut al mposi ion containing as an active ingredient at Escherichia 6011' 55 B 5 3-6 le one f h new compounds of the general formula Escherichia coli 14 12-25 g ve bove in m xture with a pharmaceutically Escherichia coli A 261 s 25-50 nf q l d iquid diluent Or carrier as hereinafter Escherichia coli 183/58 6-12 n dv p g H Proteus mirabz'lis G 12 n the p esent sp cification the expression pharma- Proteus mirabili 2935 12 c' n i ally acceptable diluent or carrier means a nonproleus vulgaris 3400 50 toxic substance that when mixed with the active in- Proteus vulgar-is 1017 17 gr l n or ingr dients renders it suitable for administra- Pseudomonas aeruginosa W 400 i n. The expr ssion preferably excludes water and low- Pseudomonas aeruginosa M 25 m l cular w ight organic Solvents Commonly used in Pseudom-onas aerugz'nosa B 25 chemical synthesis, except the presence of other Klebsiella ATCC 10031 1-2 pharmaceutically necessary ingredients such as salts in Klebsiella K 10 50 correct quantities to render the composition isotonic, Klebsiella 63 50 buffers, surfactants, colouring and -flavouring agents, and Salmonella paratyphii BB II 12 preservatives. Examples of suitable liquid diluents and Corynebacterium diphteriae gravis 5-10 7 5 carriers are vegetable oils, glycerol, propylene glycol,

polyols, buffered aqueous solutions, isotonic saline aqueous solutions, syrups and lotion bases. Examples of! suitable solid diluents and carriers are starches, cellulose and its derivatives, sugars, steara'tes and stearic acid, talc, and ointment bases. Examples of pharmaceutical compositions according to the invention are ointments, pastes, creams, sprays, lotions, aqueous and non-aqueous suspensions, emulsions, and solutions (including parenterally injectable solutions), elixirs and syrups, and granulates and powders either free-flowing or compressed into tablets.

Pharmaceutical compositions of the invention adapted for oral administration are a preferred embodiment of the invention. The diluents and carriers used are preferably therefore those that adapt the active ingredient or ingredients for oral administration. Examples of such diluents and carriers are solid vehicles, excipients and lubricants such as glucose, lactose and sucrose, corn and potato starch, sodium carboxymethyl-cellulose, ethyl cellulose and cellulose acetate, powdered gum tragacanth, gelatin, alginic acid, agar, talc, stearic acid and sodium, calcium and magnesium stearates, sodium lauryl sulphate, polyvinyl-pyrrolidone, sodium citrate, calcium carbonate, and dicalcium phosphate.

The pharmaceutical compositions of the invention may also contain other non-toxic adjuvants and modifiers such as dyes, surfactants, perfumes, fiavouring agents, such as sweeteners, preservatives and biocides.

Pharmaceutical compositions of the invention adapted 'for parenteral injection are another preferred embodiment of the invention. The diluents and carriers used are therefore preferably those that adapt the active ingredient for parenteral administration. Examples of diluents and carriers that adapt the active ingredient for parenteral administration are solvents and suspending diluents such as water, vegetable fatty oils, such as sesame oil, groundnut oil, corn oil, and cottonseed oil, aqueous propylene glycol, N,N-dimethylformamide, and dimethyl sulphoxide. In general, any non-aqueous diluent can be used that does not reduce the activity of the active ingredient and is non-toxic in the dose employed.

For the administration of the water-soluble compounds of the invention by parenteral injection sterile aqueous solutions can be employed, and are within the scope of the pharmaceutical compositions of the invention. Such aqueous solutions should preferably when necessary be buffered in the usual manner, and the liquid diluent should preferably before administration be rendered isotonic by adding the requisite amount of salt or glucose. Such sterile buffered isotonic solutions are especially suitable for intravenous, intramuscular and intraperitoneal injections. These pharmaceutical compositions of the invention can further contain local anaesthetics or substances that promote the diffusion of the active ingredient, for example hyaluronidase.

The pharmaceutical compositions of the invention preferably contain 0.5 to 90 wt. percent of at least one new compound of the invention.

The present invention also provides medicaments in dosage unit form as hereinafter defined comprising as an active ingredient at least one compound of general formula (1) given above either alone or in admixture with a pharmaceutically acceptable solid or liquid diluent or carrier. In this case the diluent or carrier is preferably as defined above but can also be water or another common solvent.

The expression medicament in dosage unit form as used in the present specification means a medicament in the form of discrete portions each containing a unit dose or a multiple or sub-multiple of a unit dose of the active ingredient(s); for example, one, two, three or four unit doses or a half, a third or a quarter of a unit dose. A unit dose is the amount of the active ingredient(s) to be administered on one occasion and will usually be a daily dose, or for example a half, a third, or a quarter of a daily dose depending on whether the medicament is to be administered once or, for example, twice, three times, or four times a day.

The discrete portions constituting the medicament in dosage unit form can include a protective envelope. The active ingredient can be undiluted and contained in such an envelope, or can be mixed with a pharmaceutically acceptable solid or liquid diluent or carrier as defined above. Such portions can for example be in monolithic coherent form, such as tablets, lozenges, pastilles, pills, suppositories, or drag-es; in wrapped or concealed form, the active ingredients being within a protective envelope, such as wrapped powders, cachets, sachets, capsules, or ampoules; or in the form of a sterile solution suitable for parenteral injection, such as ampoules of buffered isotonic, sterile, pyrogen-free aqueous solution; or in any other form known in the art.

As stated above, peroral administration is a preferred mode of administration. Preferred medicaments in dosage unit form according to the invention are therefore those adapted for oral administration, such as tablets, pills, drages, capsules, and cachets, as well as wrapped powders containing the active ingredient in powdered form with a powdered diluent or carrier for suspension in water before being taken.

As also stated above a further preferred mode of administration is parenteral administration. Preferred medicaments in dosage unit form according to the invention are therefore those adapted for parenteral injection,

such as ampoules containing a measured quantity of a sterile isotonic saline injectable aqueous solution of the new active ingredient, which may be buffered with a pharmaceutically acceptable buffer and are preferably free of pyrogens.

The preferred unit dose for administration of the medicaments of the invention is 250-16,000 mg. of active ingredient, preferably 1250-4000 mg. This will usually be administered once daily.

The invention further provides a method of combatting bacterial infection in an animal which comprises administering to the animal (preferably parenterally or perorally) an effective amount of one of the new compounds, either alone, as a pharmaceutical composition according to the invention, or as a medicament in dosage unit form according to the invention.

Indications envisaged in human medicine are especially general infections, and infections of the efferent urinary tract, caused by Gram-positive and Gram-negative bacteria and by mycoplasma, and in veterinary medicine are general infections caused by Gram-negative and Grampositive bacteria and by mycoplasma. Infections of the respiratory passages in poultry, especially in chicks, and mastitis of cows, may be mentioned particularly.

The new compounds can, as has already been mentioned, also be employed as a feedstutf additive, predominantly in raising young animals, especially chicks and fatstock.

The preparations can be administered in the feedstuff, special feedstuif preparations and feedstulf concentrates, but also via the drinking water.

The invention therefore also provides animal feedstuffs and feedstuff concentrates containing at least one of the new compounds of the general Formula (1).

The administration of the new compounds together with the feedstuif or feedstuff preparations and/or with the drinking water makes it possible to prevent or treat infections by both Gram-negative and Gram-positive bacteria and mycoplasma, and can furthermore contribute to better utilisation of the feedstuif. As examples of frequently occurring veterinary illnesses which cause considerable economic damage and which can be prevented or treated by administering the new compounds in the feedstuff or in the drinking water, there may be mentioned, in addition to general infections, infection of the air sac in chicks and mastitis in cows.

13 What is claimed is: 1. A compound of the formula 63 R NHai and each of R and R is in which each of R and R when taken independently is identical to or difierent from the other, and is selected from the group consisting of hydrogen, alkyl of l to 4 carbon atoms and hydroxyalkyl of 1 to 4 carbon atoms, or R and R together with the nitrogen atom to which they are attached form a -membered heterocyclic ring wherein the nitrogen atom is the only heteroatom or wherein oxygen or S is also present as a ring member. 2. A compound according to claim 1, wherein R and R are in which each of R and R when taken independently is hydrogen or alkyl of 1 to 4 carbon atoms or R and R together with the nitrogen atom to which they are attached form a morpholino or S,S-dioxothiomorpholine ring.

3. The compound according to claim 1, said compound being of the formula:

4. The compound according to claim 1, said compound being of the formula:

C O O Na /CHs c H=NN 5. A compound according to claim 1 wherein when R and R form a 6-membered heterocyclic ring with the nitrogen atom to which they are attached and said ring has oxygen or S0 present as a ring member, said oxygen or said S0 is in the p-position relative to the nitrogen atom to which R and R are attached.

6. A compound according to claim 1 wherein Y is hydrogen.

14 7. A compound according to claim 1 wherein Y is a sodium or potassium cation.

8. The compound according to claim 1 of the for- 9. The compound according to claim 1 of the formula:

10. The compound according to claim 1 of the formula:

11. A compound according to claim 1 wherein R and R are hydrogen, alkyl of 1 to 4 carbon atoms or hydroxyalkyl of 1 to 4 carbon atoms.

12. A compound according to claim 1 wherein R and R are hydrogen.

13. A compound according to claim 1 wherein R and R are alkyl of 1 to 4 carbon atoms.

14. A compound according to claim 1 wherein R and R are hydroxyalkyl of 1 to 4 carbon atoms.

15. A compound according to claim 1 wherein Y is hydrogen, the sodium cation, the potassium cation or the cation ea R5NH3 wherein R is wherein R and R are hydrogen or R and R together with the nitrogen atom to which they are attached form a 6-membered heterocyclic ring wherein the nitrogen atom is the only heteroatom or wherein oxygen or S0 is also present as a ring member.

References Cited UNITED STATES PATENTS 3,660,398 5/1972 Ley et al. 260 250 R 3,371,090 2/1968 Johnston 260240 G FOREIGN PATENTS 1,215,815 12/1970 England 260250 R JOHN D. RANDOLPH, Primary Examiner US. Cl. X.R. 

